After installing libuhd and uhd-host on Ubuntu 20.04.02 LTS, I observed the following error after connecting a B205 and running uhd_find_devices:
[INFO] [UHD] linux; GNU C++ version 9.2.1 20200304; Boost_107100; UHD_3.15.0.0-2build5 [ERROR] [USB] USB open failed: insufficient permissions. See the application notes for your device. No UHD Devices Found
I found this thread while googling the error, which mentions udev rules. But rather than copy/paste rules from a three year old thread, I wanted to install the rules packaged with my version of uhd. I was able to find these in /usr/lib/uhd/utils/uhd-usrp.rules, and copied them in place as follows:
sudo cp /usr/lib/uhd/utils/uhd-usrp.rules /etc/udev/rules.d/10-uhd-usrp.rules
Works now yay.
[INFO] [UHD] linux; GNU C++ version 9.2.1 20200304; Boost_107100; UHD_3.15.0.0-2build5 [INFO] [B200] Loading firmware image: /usr/share/uhd/images/usrp_b200_fw.hex...
